共查询到17条相似文献,搜索用时 93 毫秒
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采用相同的工艺,制备了含有不同内给电子体[2-甲基-2-丙基-1,3-二甲氧基丙烷、2,2-二异丁基-1,3-二甲氧基丙烷(BIBIMP)、邻苯二甲酸二异丁酯]以及不含内给电子体的MgCl2负载型Ziegler-Natta催化剂,研究了给电子体结构对催化剂活性的影响以及用该催化剂合成的聚1-丁烯(PB)的等规指数、熔点、相对分子质量及其分布。结果表明:未加入外给电子体时,加入BIBIMP的催化剂活性最高,用其所制PB的等规指数最高,分别为539 g/g和84%;加入氢气可进一步提高催化剂活性和PB等规指数;加入外给电子体后,催化剂的活性均降低,二醚类Z-N催化剂活性降低最多,而使用二异丙基二甲氧基硅烷为外给电子体更有助于提高PB的等规指数。 相似文献
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负载钛-三异丁基铝体系催化1-丁烯聚合 Ⅰ.聚合条件对1-丁烯聚合的影响 总被引:16,自引:5,他引:11
考察了负载钛(Ti)-三异丁基铝(Al)催化体系聚合条件对1-丁烯(Bt)聚合的影响。实验表明,该催化体系对Bt聚合催化效率可达34.8kg/g,聚合物为全同立构和无规立构聚1-丁烯的混合物。在一定的Ti/Bt(摩尔比)下,随着Al/Ti(摩尔比,下同)的增加和温度的升高,转化率都是先升高后下降,最佳Al/Ti值为300,温度为30℃。聚合物的相对分子质量和全同立构PBt含量均随Al/Ti和温度升高而逐渐下降。 相似文献
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负载钛—三异丁基铝体系催化1—丁烯聚合 总被引:1,自引:4,他引:1
负载钛-Al(i-Bu),催化合成的聚1-丁烯,经溶剂萃取分离和^13C-NMR测试表明为全同立构和无规立构的混合物,全同立构含量约67%,熔点为97℃。PBt生胶的拉伸强度9.7MPa,断裂伸长率490%,永久变形小于100%,邵尔A型硬度87,是一种热塑性弹性体材料。 相似文献
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负载钛体系催化合成聚1-丁烯热塑性弹性体 总被引:4,自引:1,他引:4
研究了采用TiCl4/MgCl2 Al(i Bu)3负载钛催化体系合成聚1 丁烯(PBt)热塑性弹性体的规律。结果表明:最佳聚合条件是:Bt质量分数25%,n(Ti)∶n(Bt)=1×10-5∶1,n(Al)∶n(Ti)=(200~300)∶1,温度30℃。与聚合瓶小试条件相比,由于有良好的搅拌增加了传热传质效果,因此可获得更高的聚合速率和产率,且所合成的PBt的Mw和不溶物含量均较相同聚合条件下聚合瓶中的有所降低;氢气可有效调节PBt相对分子质量。 相似文献
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采用负载钛催化剂,在0 ̄30℃下对异戊二烯(Ip)本体沉淀聚合的动力学进行了研究。结果表明,体系在单体相未消失之前为稳态聚合,其稳态聚合速率方程为:Rp=kpf[Ti]0[Al]0[M]0,即在单体相未消失前,Rp为恒量。计算出Ip本体沉淀聚合的表观活化能为29.7kJ/mol,催化剂利用率为20% ̄30%,高于溶液聚合法。 相似文献
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TiCl4/MgCl2-AIEt3体系合成聚1-丁烯 总被引:1,自引:0,他引:1
以负载钛体系(简称Ti)为主催化剂,三乙基铝(简称Al为助催化剂,加氢汽油为溶剂,用溶液聚合法合成了聚1-丁烯。研究了n(Ti)/n(Bt)、n(Al)/n(Ti)、反应温度、反应时间对转化率、催化效率、聚合物的特性粘数[η]及其全同立构含量的影响。结果表明,随n(Ti)/n(Bt)增加,转化率和催化效率都不断提高;随n(Al)/n(Ti)增加、反应温度升高,转化率和催化效率呈先上升后下降趋势;随n(Al)/n(Ti)、n(Ti)/n(Bt)增大和反应温度的升高,特性粘数逐渐下降,但其对全同立构含量影响较小。 相似文献
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MgCl2‐supported TiCl4 catalysts containing diethyl norbornene‐2,3‐dicarboxylate internal electron donor for 1‐butene polymerization: Effects of internal electron donor configuration 下载免费PDF全文
Xiaofang Dong Li Zhang Zhibo Liu Min Yang Zhongyu Duan Kaihu Hou Binyuan Liu IL Kim 《应用聚合物科学杂志》2014,131(18)
Three isomeric 5‐norbornene‐2,3‐dicarboxylic acid diethyl ester (NDDE) with endo‐, exo‐, and trans‐configuration have been synthesized and employed as internal electron donors (IED) in 1‐butene polymerization over magnesium chloride supported Ziegler–Natta catalysts. It was found that the configuration of NDDE plays a key role in tuning the catalyst activity, stereospecificity, molecular weight (MW), and polydispersity index (PDI) of resulting poly(1‐butene). The type of catalyst with cis‐5‐norbornene‐endo‐2,3‐dicarboxylic acid diethyl ester as IED shows the highest catalyst activity, while catalyst with trans‐NDDE as IED yields the poly(1‐butene) with the highest MW and the most broad PDI. IR results showed that the NDDE with endo‐, exo‐, and trans‐configuration have different coordination way to MgCl2, subsequently affecting the catalysts performance. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40758. 相似文献
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Zhao Yongxian Shao Huafeng Wang Bo Yao Wei Huang Baochen 《Frontiers of Chemical Engineering in China》2007,1(3):304-309
With TiCl4/MgCl2 (Ti) and Al(i-Bu)3 (Al) as catalysts, the thermoplastic copolymer of 1-butene(Bt) and 1-hexene(He) was synthesized successfully. The effects
of Bt/He, Ti/(He+Bt), Al/Ti, temperature and reaction time on conversion, catalyst efficiency(CE), intrinsic viscosity([η]) and insoluble content were studied. The copolymer was analyzed with Fourier transform-infrared (FTIR) and nuclear magnetic
resonance (1H-NMR). Results showed that the optimal polymerization conditions were: He/Bt = 0.25, temperature 40°C−50°C, Al/Ti = 400−500,
Ti/(Bt+He) = 3 × 10−5 − 4 × 10−5, time 4 h. Intrinsic viscosity was found to increase with increasing Ti/(Bt+He) and decreasing Al/Ti and polymerization temperature.
When the molar content of He, Al/Ti and polymerization temperature increased, the insoluble content in CH2Cl2 of copolymers decreased. When Ti/(Bt+He) and reaction time increased, the insoluble content in CH2Cl2 of copolymers also increased. The crystallization and stereoregularity of poly(1-butene) decreased with the addition of He.
Translated from China Synthetic Rubber Industry, 2006, 29(6): 429–434 [译自: 合成橡胶工业] 相似文献